Abstract
Background
Several experimental studies have indicated that increased plasma osmolarity caused by recurrent dehydration is involved in kidney injury via a mechanism, mediated by vasopressin secretion and activation of the aldose reductase pathway. Epidemiologic evidence linking increased plasma osmolarity and the onset of end-stage kidney disease (ESKD), in patients with primary glomerulonephritis, is lacking.
Methods
We retrospectively examined 663 patients with IgA nephropathy (IgAN) diagnosed by kidney biopsy and evaluated the association between estimated plasma osmolarity and ESKD prevalence, using a Cox proportional hazards model.
Results
During follow-up (median 80.4 months; interquartile range 22.2–120.1), 73 patients developed ESKD. In a baseline survey, plasma osmolarity was correlated negatively with the mean value of the estimated glomerular filtration rate, but correlated positively with the mean value of urinary protein excretion, systolic blood pressure, and pathologic severity of extracapillary proliferation, in addition to tissue fibrosis and sclerosis. The incidence rate of ESKD increased linearly with increase in plasma osmolarity (P < 0.05 for trend). In multivariate analyses, plasma osmolarity was an independent risk factor for ESKD (hazard ratio for each increment of 5 mOsm/kg in plasma osmolarity 1.56; 95% confidence interval 1.18–2.07) even after adjustment for potential confounders.
Conclusions
Increased plasma osmolarity was associated significantly with an increased risk of ESKD in patients with IgAN. Maintenance of plasma osmolarity by appropriate control of the balance between salt and water may contribute to kidney protection.
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Acknowledgements
The authors would like to thank the investigators at the participating institutions: Tetsuhiko Yoshida, M.D., Hirofumi Ikeda, M.D., Ph.D., Takashi Inenaga, M.D., Akinori Nagashima, M.D., Ph.D., and Tadashi Hirano, M.D. We also thank Arshad Makhdum, PhD, from Edanz Group (https://www.edanzediting.com/ac) for editing a draft of this manuscript. This study was supported by Grants-in-Aid for Scientific Research (18K17405) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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This study was supported by Grants-in-Aid for Scientific Research (18K17405) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Shigeru Tanaka contributed to the study design, acquisition of data, statistical analyses, interpretation of data, and drafting of the manuscript. Toshiaki Nakano contributed to the funding, acquisition of data, and critical revision of the manuscript. Kosuke Masutani and Akihiro Tsuchimoto contributed to the pathologic evaluation of kidney biopsies, and critical revision of the manuscript. Masanori Tokumoto, Hiroaki Ooboshi and Takanari Kitazono contributed to the critical revision of the manuscript and study supervision. All authors provided critical reviews of the draft and approved the final version.
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Tanaka, S., Nakano, T., Tokumoto, M. et al. Estimated plasma osmolarity and risk of end-stage kidney disease in patients with IgA nephropathy. Clin Exp Nephrol 24, 910–918 (2020). https://doi.org/10.1007/s10157-020-01919-3
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DOI: https://doi.org/10.1007/s10157-020-01919-3